Yehuwdah Chad-Umoren | University of Port Harcourt (original) (raw)

Papers by Yehuwdah Chad-Umoren

Journal of environment and earth science, 2017

This study evaluated the concentration of radionuclides and radiation hazard indices for water wi... more This study evaluated the concentration of radionuclides and radiation hazard indices for water with the use of gamma spectrometer in 10 different communities of Abak Local Government Area of Akwa Ibom State, Nigeria to serve as baseline data on the radiological status of the area. The results show that the commonly occurring radionuclides are not uniformly distributed in the water. The mean activity concentration of 40K, 238U and 232Th in the samples were estimated to be 105.46±8.16 Bq/l, 13.02±3.13 Bq/l and 2.44±0.21; Bq/l respectively. These values are well below internationally determined permissible exposure limits. The hazard indices radium equivalent activity, absorbed dose rate, effective dose rate, external and internal hazard indices had mean values of 24.6±4.06 Bq/l, 11.9±1.92 nGy/h, 0.02±0.002mSv/yr, 0.07±0.01 and 0.1±0.02 respectively.The computed hazard indices are all below the recommended standards. Therefore the water at the present time poses no radiological health ...

Research Journal of Mathematics and Statistics, 2013

This study investigates the influence of radiation and mass concentration on Magnetohydrodynamic ... more This study investigates the influence of radiation and mass concentration on Magnetohydrodynamic (MHD) flow over a moving plate with time dependent suction in an optically thin environment. By introducing fairly realistic assumptions and for a small time dependent perturbation, the concentration temperature and velocity profiles are obtained. The effects of magnetic parameter M, radiation parameter F, porosity parameter X and G r on the flow variables are discussed qualitatively.

Physical Science International Journal, 2019

Aim: The aim of this study is radiometric survey of oil and gas wastes and its health risks in Ni... more Aim: The aim of this study is radiometric survey of oil and gas wastes and its health risks in Niger Delta region of Nigeria. Study Design: This study was purely an experimental work which involves collection of samples and laboratory analysis. Place and Duration of the Study: This study was carried out at oil and gas company waste stream facilities and waste pipe market within Niger Delta region between June 2018 and May, 2019. Methodology: Sixteen samples (4 drill cuttings, 4 pipe scales, 2 sludges and 6 produced water) were randomly collected from four waste streams in six locations within the oil and gas production facilities and used pipe market. These samples were taken to the laboratory, prepared following the ISO procedure and packaged in a porcelain bottle, sealed and kept for twenty eight days in order to ensure secular equilibrium between 238U, 232Th and their progenies and counted with high purity Germanium detector (HPGe). The activity concentration of all the radionuc...

Asian Journal of Physical and Chemical Sciences, 2019

The aim of this study is to determine the occupational hazards due to exposure to gamma radiation... more The aim of this study is to determine the occupational hazards due to exposure to gamma radiations from oil and gas facilities. In-situ measurement of radiation exposure rate of some Oil Field Facilities in Rivers State, Nigeria carried out using Digilert 200 and Radalert 100 nuclear radiation monitor and a geographical positioning system (Garmin GPSMAP 76S). The average exposure rates of the facilities range from 0.010±0.002 to 0.015±0.001, for indoor and 0.014±0.003 to 0.027±0.003 for outdoor. The mean absorbed dose rates for indoor varied from 92.1 to 121.1 nGyh-1 while the mean outdoor absorbed dose varied from 120.4 to 234.2 nGyh-1. The estimated indoor annual effective dose varied from 0.14 to 0.19 mSvy-1 while the outdoor annual effective dose varied from 0.23 to 0.36 m Svy-1.The estimated indoor excess lifetime cancer risk (ELCR) range from 0.56× to 0.65x10-3 and outdoor ranged from 0.65×5 to 1.26×. The respective mean values of absorbed dose, AEDE and ELCR for indoor and ...

Advances in Physics Theories and Applications, 2014

A gamma spectroscopy analysis for the naturally occurring radionuclides 226 Ra, 232 Th and 40 K h... more A gamma spectroscopy analysis for the naturally occurring radionuclides 226 Ra, 232 Th and 40 K has been carried out for soil samples collected from communities in Abak Local Government Area of Akwa Ibom State to determine the concentration and distribution patterns of these radionuclides in the study area and to assess the possible radiological risks from the soil. The activity concentration of the samples range from 14.80±1.16Bq/kg to 150.20±11.47Bq/kg with a mean value of 98.709±7.693Bq/kg for 40 K; from 14.52±3.49Bq/kg to 42.04±8.59Bq/kg for 238 U with a mean of 24.826±5.425Bq/kg and from 3.05±0.27Bq/kg to 7.00±0.58Bq/kg with a mean of 5.172±0.31Bq/kg for 232 Th. These values are within international regulatory standards. Assessment of the radiation hazard levels for the area gave values of 18.789±3.102nGy/h for absorbed dose, 0.3±0.05Bq/kg for representative level index, 39.82±6.65Bq/kg for radium equivalent, 0.11±0.02 for external hazard index, 0.18±0.032 for internal hazard index and 0.023±0.004mS/yr for effective dose rate. These indices are much lower than the ICRP permissible limits for soil showing that the soil of the study area poses no radiological threats to the public.

Advances in Physics Theories and Applications, 2014

The effect of the odd-even nature and mass of target nucleus on neutron reaction cross-sections h... more The effect of the odd-even nature and mass of target nucleus on neutron reaction cross-sections have been investigated for the energy range of 1-30 MeV for neutron-induced reactions in the odd-A nuclides: , and using the EXIFON code. This code which uses one global parameter set and is based on the analytical model for statistical multistep direct and multistep compound reactions, was used to calculate crosssections for the (n, α), (n, p), and (n, 2n) reactions. Calculations were compared with experimental data (EXFOR) and evaluated data (ENDF) from the IAEA nuclear data bank. Results show that charged particle emissions ((n, α) and (n, p)) are the most dominant reaction channels in the light and intermediate mass nuclei considered. Results also show that the Na (n, 2n) reaction cross-section over predicted experimental and evaluated data, while the Na (n, α) reaction agrees with experimental data and was in fair agreement with evaluated data while the Na (n, p) cross-section under predicted experimental and evaluated data. For magnesium, the (n, 2n) cross-section partially agree with evaluated cross-section, while the (n, α) and (n, p) cross-sections under predicted evaluated data. And for aluminium, the calculated (n, 2n) cross-section over predicted experimental and evaluated data, the (n, α) data fairly reproduced experimental and evaluated crosssections while the (n, p) reaction cross-section was in fair agreement with experimental and evaluated data. The explanations for the discrepancies and trends observed have been given.

Journal of Natural Sciences Research, 2014

Nigeria's current dismal national power generation capacity provides impetus for the present ques... more Nigeria's current dismal national power generation capacity provides impetus for the present quest by the federal government to exploit alternative energy sources for beneficial domestic and industrial usage. A critical component of this strategic endeavour is the effort to exploit the potential of the atom for purposes of nuclear power generation. However, the nuclear industry is confronted with diverse challenges; prominent among these is the problem of ionizing radiation management. In this paper, we examine the nuclear fuel cycle and the challenges of efficient radioactive waste disposal procedures and techniques, highlighting the underlying principles for the various procedures, the current global scientific and technical issues in radioactive waste management and the risk of terrorist attack on spent fuel storage facilities. Our findings indicate that in spite of the challenges of the nuclear industry, effective nuclear fuel management procedures are available making nuclear energy a viable alternative for purposes of national energy security.

Journal of Energy Technologies and Policy, 2013

The industrialization programme of any nation is driven by its power sector so that the industria... more The industrialization programme of any nation is driven by its power sector so that the industrialization process becomes epileptic when the power sector becomes epileptic. This has been the challenge facing Nigeria. The national grid has an installed capacity of 6,000 MW, but only about 4,000 MW is obtainable. Also, pipeline vandalisation disrupts the supply lines to the few functional plants, while water shortage and irregular supply incapacitate the effective functioning of the nation's hydroelectric power plants. These factors along with the increasing national energy demand for both domestic and industrial purposes made the nuclear power option attractive to Nigeria and informed the nation's pursuit of the nuclear power option. Nuclear power has not only been adjudged economically competitive and environmentally friendly, but is also a viable alternative for longterm energy security. Nuclear power plants have low operational costs and the added advantage of long life spans. This paper examines Nigeria's nuclear power generation programme with emphasis on how far Nigeria has gone, the successes recorded, the problems encountered and the plans to be implemented for the first nuclear power plant to become functional. The various issues of concern in deploying nuclear power plants for electricity generation are also discussed.

Acta Physica Polonica A, 2015

The solution of spinless Salpeter equation with generalized Hulthén potential using SUSYQM formal... more The solution of spinless Salpeter equation with generalized Hulthén potential using SUSYQM formalism is presented. We obtained approximately the energy eigenvalues and the corresponding wave function in a closed form for any arbitrary l state. We have also reported on the numerical result of our work.

IOSR Journal of Applied Physics, 2014

This paper presents a mathematical model of the Collect and Discharge Tank unit of the rain drive... more This paper presents a mathematical model of the Collect and Discharge Tank unit of the rain driven hydro power generator currently being designed using the University of Port Harcourt's faculty of science building at Ofrima, Abuja Campus. The model revealed that over 2.0KW of power can be generated using rain water collected from the building, and that a minimum of 3,751 gallons storage capacity tank is needed to make sure that the unused water accumulated from a 0.6 inches per hour of rainfall is effectively stored if rainfall lasts for 33.33 minutes. This means that for the tank to effectively serve its purpose when rainfall at the rate of 0.6 inches per hour lasts for over 33.33 minutes, a larger capacity size of tank is needed, or the hydro power generating system is redesigned to generate power greater than 2.0KW.

Journal of Scientific Research, 2010

We have analytically solved the radial Schrödinger equation with inverted Woods-Saxon and Manning... more We have analytically solved the radial Schrödinger equation with inverted Woods-Saxon and Manning-Rosen Potentials. With the ansatz for the wave function, we obtain the generalized wave function and the negative energy spectrum for the system.Keywords: Inverted Woods-Saxon Potentials; Manning-Rosen Potential; Schrödinger Equation.© 2011 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi:10.3329/jsr.v3i1.5310 J. Sci. Res. 3 (1), 25-33 (2011)

… JOURNAL OF PURE …, 2010

In this study, two hair dye types, one liquid and the other solid, were analyzed to determine the... more In this study, two hair dye types, one liquid and the other solid, were analyzed to determine their elemental compositions and possible radioactivity. The liquid dye sample was analyzed using Flame Atomic Absorption Spectroscopy and based on the American ...

… -series: Working and …, 2009

Most universities in Nigeria have high concentrations of photocopiers and computers positioned al... more Most universities in Nigeria have high concentrations of photocopiers and computers positioned all over their campuses, often indiscriminately and without regard for the environmental health implications of the radiations emanating from these machines. We ...

Journal of Applied Sciences and Environmental Management, 2013

The oil and gas rich Niger Delta region of Nigeria is characterized by environmental degradation ... more The oil and gas rich Niger Delta region of Nigeria is characterized by environmental degradation leading to environmental pollution from oil and gas activities. This study examined the gross α and β activity in thirty (river/stream, well and tap) water samples collected from ten oil fields in the Western Niger Delta region of Nigeria. The counting system employed in this analysis is the Gas-flow proportional counter {Eurisys Measure IN20 low-background multiple (eight) channel counter}. Gross alpha activity concentration range from 0.01±0.002 to 0.7±0.01 (0.15±0.003) Bql-1 , 0.01±0.003 to 0.5±0.01 (0.1±0.003)Bql-1 and 0.02±0.001 to 35.1±1.1 (4.1±0.1) Bql-1 while beta activity concentration ranged from 1.1±0.04 to 13.2±0.1 (6.0±0.1) Bql-1 , 0.7±0.1 to 54.7±1.3 (8.9±0.2)Bql-1 and 0.7±0.03 to 151.2±1.8 (40.1±0.9)Bql-1 for well, tap and river waters respectively. Correlation value between α and β activities in well, tap and river water is 0.025, 0.047 and 0.512 respectively. The results show that except for the alpha activity in the tap water samples, the average natural activity concentrations of αand β-emitting radionuclides in the samples are slightly above the WHO recommended limit. For all samples the gross β activities are higher than the corresponding gross α activities. The mean effective equivalent dose intake per year due to alpha activity in the water samples for adults and infants are: 76.4±1.8 and 20.9±55µSvy-1 , 54.6±1.3 and 14.9±0.4 µSvy-1 , and 2118±70 and 584±19.2µSvy-1 in well, tap, and river water samples respectively. The results obtained for dose intake are below the WHO recommended reference level of 0.1mSvy-1 , except for the water sample from Uzere river. This study indicates that the water sources evaluated, especially the rivers, are contaminated radiologically. @JASEM Gross α and β Activity Concentration 268 1 EZEKIEL O. AGBALAGBA; GREGORY O. AVWIRI; YEHUWDAH E. CHAD-UMOREN guidelines for activity concentration in drinking water are 0.1Bql-1 for gross alpha and 1.0 Bql-1 for gross beta activity (Damla, et al., 2006).

Zeitschrift für Naturforschung A, 2014

The bound-state solutions of the Dirac equation for the screened Coulomb potential plus a ringsha... more The bound-state solutions of the Dirac equation for the screened Coulomb potential plus a ringshaped- like potential are determined using supersymmetry quantum mechanics and invariance method for arbitrary angular momentum state J. In the calculations, a proper approximate scheme for the centrifugal term is proposed and the un-normalized eigenfunctions are obtained in terms of the hypergeometric functions.

A survey of radioactivity concentration in soil and water from the Port Harcourt refinery company... more A survey of radioactivity concentration in soil and water from the Port Harcourt refinery company host community was carried out using the gamma ray spectrometer with NaI(TI) detector to determine the concentration of the primordial radionuclides 226Ra, 232Th and 40K. 20 samples (10 each of soil and water) were collected at random from various parts of the community. The mean specific activity obtained for 40K was 76.64  22.93 Bq kg-1 (soil), with a range of 41.54  14.80 - 175.54 39.53 Bqkg–1 and 58.88 ± 21.66 Bq l-1 (water) with a range of 36.09  14.06 - 121.18  28.75 Bq l-1. For 226Ra (soil), the mean specific activity was 7.43  3.47 Bq kg-1with a range of 6.62  2.24 – 10.10  4.16Bq Kg–1 and 4.16 ± 1.97 Bq l-1 (water) with a range of 2.61  1.23- 5.46  1.66 Bq l-1 and the mean specific activity for 232Th (soil) was 4.71  2.46 Bq kg-1 with a range of 3.25  2.10 - 6.26  4.01 Bq kg–1 and 3.30 ± 1.90 Bq l-1 (water ) with a range of 2.46  2.08 - 4.16  2.07Bq l-1. The radi...

Current Topics in Ionizing Radiation Research, 2012

Journal of Environmental Engineering and Landscape Management, 2010

... count rates and dose equivalents for Abonnema, Kula, Idama, Bile, Ke, Obuama and Bakana (Rive... more ... count rates and dose equivalents for Abonnema, Kula, Idama, Bile, Ke, Obuama and Bakana (Riverine communi-ties) (Sigalo and Briggs-Kamara 2004) ... reported in some areas of Brazil, China and India due to the geo-logy of the environment (Holmes-Siodle and Adams 1993 ...

Journal of environment and earth science, 2017

This study evaluated the concentration of radionuclides and radiation hazard indices for water wi... more This study evaluated the concentration of radionuclides and radiation hazard indices for water with the use of gamma spectrometer in 10 different communities of Abak Local Government Area of Akwa Ibom State, Nigeria to serve as baseline data on the radiological status of the area. The results show that the commonly occurring radionuclides are not uniformly distributed in the water. The mean activity concentration of 40K, 238U and 232Th in the samples were estimated to be 105.46±8.16 Bq/l, 13.02±3.13 Bq/l and 2.44±0.21; Bq/l respectively. These values are well below internationally determined permissible exposure limits. The hazard indices radium equivalent activity, absorbed dose rate, effective dose rate, external and internal hazard indices had mean values of 24.6±4.06 Bq/l, 11.9±1.92 nGy/h, 0.02±0.002mSv/yr, 0.07±0.01 and 0.1±0.02 respectively.The computed hazard indices are all below the recommended standards. Therefore the water at the present time poses no radiological health ...

Research Journal of Mathematics and Statistics, 2013

This study investigates the influence of radiation and mass concentration on Magnetohydrodynamic ... more This study investigates the influence of radiation and mass concentration on Magnetohydrodynamic (MHD) flow over a moving plate with time dependent suction in an optically thin environment. By introducing fairly realistic assumptions and for a small time dependent perturbation, the concentration temperature and velocity profiles are obtained. The effects of magnetic parameter M, radiation parameter F, porosity parameter X and G r on the flow variables are discussed qualitatively.

Physical Science International Journal, 2019

Aim: The aim of this study is radiometric survey of oil and gas wastes and its health risks in Ni... more Aim: The aim of this study is radiometric survey of oil and gas wastes and its health risks in Niger Delta region of Nigeria. Study Design: This study was purely an experimental work which involves collection of samples and laboratory analysis. Place and Duration of the Study: This study was carried out at oil and gas company waste stream facilities and waste pipe market within Niger Delta region between June 2018 and May, 2019. Methodology: Sixteen samples (4 drill cuttings, 4 pipe scales, 2 sludges and 6 produced water) were randomly collected from four waste streams in six locations within the oil and gas production facilities and used pipe market. These samples were taken to the laboratory, prepared following the ISO procedure and packaged in a porcelain bottle, sealed and kept for twenty eight days in order to ensure secular equilibrium between 238U, 232Th and their progenies and counted with high purity Germanium detector (HPGe). The activity concentration of all the radionuc...

Asian Journal of Physical and Chemical Sciences, 2019

The aim of this study is to determine the occupational hazards due to exposure to gamma radiation... more The aim of this study is to determine the occupational hazards due to exposure to gamma radiations from oil and gas facilities. In-situ measurement of radiation exposure rate of some Oil Field Facilities in Rivers State, Nigeria carried out using Digilert 200 and Radalert 100 nuclear radiation monitor and a geographical positioning system (Garmin GPSMAP 76S). The average exposure rates of the facilities range from 0.010±0.002 to 0.015±0.001, for indoor and 0.014±0.003 to 0.027±0.003 for outdoor. The mean absorbed dose rates for indoor varied from 92.1 to 121.1 nGyh-1 while the mean outdoor absorbed dose varied from 120.4 to 234.2 nGyh-1. The estimated indoor annual effective dose varied from 0.14 to 0.19 mSvy-1 while the outdoor annual effective dose varied from 0.23 to 0.36 m Svy-1.The estimated indoor excess lifetime cancer risk (ELCR) range from 0.56× to 0.65x10-3 and outdoor ranged from 0.65×5 to 1.26×. The respective mean values of absorbed dose, AEDE and ELCR for indoor and ...

Advances in Physics Theories and Applications, 2014

A gamma spectroscopy analysis for the naturally occurring radionuclides 226 Ra, 232 Th and 40 K h... more A gamma spectroscopy analysis for the naturally occurring radionuclides 226 Ra, 232 Th and 40 K has been carried out for soil samples collected from communities in Abak Local Government Area of Akwa Ibom State to determine the concentration and distribution patterns of these radionuclides in the study area and to assess the possible radiological risks from the soil. The activity concentration of the samples range from 14.80±1.16Bq/kg to 150.20±11.47Bq/kg with a mean value of 98.709±7.693Bq/kg for 40 K; from 14.52±3.49Bq/kg to 42.04±8.59Bq/kg for 238 U with a mean of 24.826±5.425Bq/kg and from 3.05±0.27Bq/kg to 7.00±0.58Bq/kg with a mean of 5.172±0.31Bq/kg for 232 Th. These values are within international regulatory standards. Assessment of the radiation hazard levels for the area gave values of 18.789±3.102nGy/h for absorbed dose, 0.3±0.05Bq/kg for representative level index, 39.82±6.65Bq/kg for radium equivalent, 0.11±0.02 for external hazard index, 0.18±0.032 for internal hazard index and 0.023±0.004mS/yr for effective dose rate. These indices are much lower than the ICRP permissible limits for soil showing that the soil of the study area poses no radiological threats to the public.

Advances in Physics Theories and Applications, 2014

The effect of the odd-even nature and mass of target nucleus on neutron reaction cross-sections h... more The effect of the odd-even nature and mass of target nucleus on neutron reaction cross-sections have been investigated for the energy range of 1-30 MeV for neutron-induced reactions in the odd-A nuclides: , and using the EXIFON code. This code which uses one global parameter set and is based on the analytical model for statistical multistep direct and multistep compound reactions, was used to calculate crosssections for the (n, α), (n, p), and (n, 2n) reactions. Calculations were compared with experimental data (EXFOR) and evaluated data (ENDF) from the IAEA nuclear data bank. Results show that charged particle emissions ((n, α) and (n, p)) are the most dominant reaction channels in the light and intermediate mass nuclei considered. Results also show that the Na (n, 2n) reaction cross-section over predicted experimental and evaluated data, while the Na (n, α) reaction agrees with experimental data and was in fair agreement with evaluated data while the Na (n, p) cross-section under predicted experimental and evaluated data. For magnesium, the (n, 2n) cross-section partially agree with evaluated cross-section, while the (n, α) and (n, p) cross-sections under predicted evaluated data. And for aluminium, the calculated (n, 2n) cross-section over predicted experimental and evaluated data, the (n, α) data fairly reproduced experimental and evaluated crosssections while the (n, p) reaction cross-section was in fair agreement with experimental and evaluated data. The explanations for the discrepancies and trends observed have been given.

Journal of Natural Sciences Research, 2014

Nigeria's current dismal national power generation capacity provides impetus for the present ques... more Nigeria's current dismal national power generation capacity provides impetus for the present quest by the federal government to exploit alternative energy sources for beneficial domestic and industrial usage. A critical component of this strategic endeavour is the effort to exploit the potential of the atom for purposes of nuclear power generation. However, the nuclear industry is confronted with diverse challenges; prominent among these is the problem of ionizing radiation management. In this paper, we examine the nuclear fuel cycle and the challenges of efficient radioactive waste disposal procedures and techniques, highlighting the underlying principles for the various procedures, the current global scientific and technical issues in radioactive waste management and the risk of terrorist attack on spent fuel storage facilities. Our findings indicate that in spite of the challenges of the nuclear industry, effective nuclear fuel management procedures are available making nuclear energy a viable alternative for purposes of national energy security.

Journal of Energy Technologies and Policy, 2013

The industrialization programme of any nation is driven by its power sector so that the industria... more The industrialization programme of any nation is driven by its power sector so that the industrialization process becomes epileptic when the power sector becomes epileptic. This has been the challenge facing Nigeria. The national grid has an installed capacity of 6,000 MW, but only about 4,000 MW is obtainable. Also, pipeline vandalisation disrupts the supply lines to the few functional plants, while water shortage and irregular supply incapacitate the effective functioning of the nation's hydroelectric power plants. These factors along with the increasing national energy demand for both domestic and industrial purposes made the nuclear power option attractive to Nigeria and informed the nation's pursuit of the nuclear power option. Nuclear power has not only been adjudged economically competitive and environmentally friendly, but is also a viable alternative for longterm energy security. Nuclear power plants have low operational costs and the added advantage of long life spans. This paper examines Nigeria's nuclear power generation programme with emphasis on how far Nigeria has gone, the successes recorded, the problems encountered and the plans to be implemented for the first nuclear power plant to become functional. The various issues of concern in deploying nuclear power plants for electricity generation are also discussed.

Acta Physica Polonica A, 2015

The solution of spinless Salpeter equation with generalized Hulthén potential using SUSYQM formal... more The solution of spinless Salpeter equation with generalized Hulthén potential using SUSYQM formalism is presented. We obtained approximately the energy eigenvalues and the corresponding wave function in a closed form for any arbitrary l state. We have also reported on the numerical result of our work.

IOSR Journal of Applied Physics, 2014

This paper presents a mathematical model of the Collect and Discharge Tank unit of the rain drive... more This paper presents a mathematical model of the Collect and Discharge Tank unit of the rain driven hydro power generator currently being designed using the University of Port Harcourt's faculty of science building at Ofrima, Abuja Campus. The model revealed that over 2.0KW of power can be generated using rain water collected from the building, and that a minimum of 3,751 gallons storage capacity tank is needed to make sure that the unused water accumulated from a 0.6 inches per hour of rainfall is effectively stored if rainfall lasts for 33.33 minutes. This means that for the tank to effectively serve its purpose when rainfall at the rate of 0.6 inches per hour lasts for over 33.33 minutes, a larger capacity size of tank is needed, or the hydro power generating system is redesigned to generate power greater than 2.0KW.

Journal of Scientific Research, 2010

We have analytically solved the radial Schrödinger equation with inverted Woods-Saxon and Manning... more We have analytically solved the radial Schrödinger equation with inverted Woods-Saxon and Manning-Rosen Potentials. With the ansatz for the wave function, we obtain the generalized wave function and the negative energy spectrum for the system.Keywords: Inverted Woods-Saxon Potentials; Manning-Rosen Potential; Schrödinger Equation.© 2011 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi:10.3329/jsr.v3i1.5310 J. Sci. Res. 3 (1), 25-33 (2011)

… JOURNAL OF PURE …, 2010

In this study, two hair dye types, one liquid and the other solid, were analyzed to determine the... more In this study, two hair dye types, one liquid and the other solid, were analyzed to determine their elemental compositions and possible radioactivity. The liquid dye sample was analyzed using Flame Atomic Absorption Spectroscopy and based on the American ...

… -series: Working and …, 2009

Most universities in Nigeria have high concentrations of photocopiers and computers positioned al... more Most universities in Nigeria have high concentrations of photocopiers and computers positioned all over their campuses, often indiscriminately and without regard for the environmental health implications of the radiations emanating from these machines. We ...

Journal of Applied Sciences and Environmental Management, 2013

The oil and gas rich Niger Delta region of Nigeria is characterized by environmental degradation ... more The oil and gas rich Niger Delta region of Nigeria is characterized by environmental degradation leading to environmental pollution from oil and gas activities. This study examined the gross α and β activity in thirty (river/stream, well and tap) water samples collected from ten oil fields in the Western Niger Delta region of Nigeria. The counting system employed in this analysis is the Gas-flow proportional counter {Eurisys Measure IN20 low-background multiple (eight) channel counter}. Gross alpha activity concentration range from 0.01±0.002 to 0.7±0.01 (0.15±0.003) Bql-1 , 0.01±0.003 to 0.5±0.01 (0.1±0.003)Bql-1 and 0.02±0.001 to 35.1±1.1 (4.1±0.1) Bql-1 while beta activity concentration ranged from 1.1±0.04 to 13.2±0.1 (6.0±0.1) Bql-1 , 0.7±0.1 to 54.7±1.3 (8.9±0.2)Bql-1 and 0.7±0.03 to 151.2±1.8 (40.1±0.9)Bql-1 for well, tap and river waters respectively. Correlation value between α and β activities in well, tap and river water is 0.025, 0.047 and 0.512 respectively. The results show that except for the alpha activity in the tap water samples, the average natural activity concentrations of αand β-emitting radionuclides in the samples are slightly above the WHO recommended limit. For all samples the gross β activities are higher than the corresponding gross α activities. The mean effective equivalent dose intake per year due to alpha activity in the water samples for adults and infants are: 76.4±1.8 and 20.9±55µSvy-1 , 54.6±1.3 and 14.9±0.4 µSvy-1 , and 2118±70 and 584±19.2µSvy-1 in well, tap, and river water samples respectively. The results obtained for dose intake are below the WHO recommended reference level of 0.1mSvy-1 , except for the water sample from Uzere river. This study indicates that the water sources evaluated, especially the rivers, are contaminated radiologically. @JASEM Gross α and β Activity Concentration 268 1 EZEKIEL O. AGBALAGBA; GREGORY O. AVWIRI; YEHUWDAH E. CHAD-UMOREN guidelines for activity concentration in drinking water are 0.1Bql-1 for gross alpha and 1.0 Bql-1 for gross beta activity (Damla, et al., 2006).

Zeitschrift für Naturforschung A, 2014

The bound-state solutions of the Dirac equation for the screened Coulomb potential plus a ringsha... more The bound-state solutions of the Dirac equation for the screened Coulomb potential plus a ringshaped- like potential are determined using supersymmetry quantum mechanics and invariance method for arbitrary angular momentum state J. In the calculations, a proper approximate scheme for the centrifugal term is proposed and the un-normalized eigenfunctions are obtained in terms of the hypergeometric functions.

A survey of radioactivity concentration in soil and water from the Port Harcourt refinery company... more A survey of radioactivity concentration in soil and water from the Port Harcourt refinery company host community was carried out using the gamma ray spectrometer with NaI(TI) detector to determine the concentration of the primordial radionuclides 226Ra, 232Th and 40K. 20 samples (10 each of soil and water) were collected at random from various parts of the community. The mean specific activity obtained for 40K was 76.64  22.93 Bq kg-1 (soil), with a range of 41.54  14.80 - 175.54 39.53 Bqkg–1 and 58.88 ± 21.66 Bq l-1 (water) with a range of 36.09  14.06 - 121.18  28.75 Bq l-1. For 226Ra (soil), the mean specific activity was 7.43  3.47 Bq kg-1with a range of 6.62  2.24 – 10.10  4.16Bq Kg–1 and 4.16 ± 1.97 Bq l-1 (water) with a range of 2.61  1.23- 5.46  1.66 Bq l-1 and the mean specific activity for 232Th (soil) was 4.71  2.46 Bq kg-1 with a range of 3.25  2.10 - 6.26  4.01 Bq kg–1 and 3.30 ± 1.90 Bq l-1 (water ) with a range of 2.46  2.08 - 4.16  2.07Bq l-1. The radi...

Current Topics in Ionizing Radiation Research, 2012

Journal of Environmental Engineering and Landscape Management, 2010

... count rates and dose equivalents for Abonnema, Kula, Idama, Bile, Ke, Obuama and Bakana (Rive... more ... count rates and dose equivalents for Abonnema, Kula, Idama, Bile, Ke, Obuama and Bakana (Riverine communi-ties) (Sigalo and Briggs-Kamara 2004) ... reported in some areas of Brazil, China and India due to the geo-logy of the environment (Holmes-Siodle and Adams 1993 ...